Remove codec::Encode and codec::Decode derives from generated APIs by default (#2008)

* Remove codec::Encode and codec::Decode from generated APIs by default

* clippy fixes

* clippy

* More fixes, and CompactAs only if Encode/Decode

* revert println in example

* fix lightclient test

* fix docs

* Fix another rust doc comment

* Fix failing storage test

* Remove now-unnecessary test

* clippy

* clippy

* Remove pointless clone

subxt/examples/runtime_apis_raw.rs

@@ -1,5 +1,5 @@
 #![allow(missing_docs)]
-use subxt::ext::codec::Compact;
+use subxt::ext::codec::{Compact, Decode};
 use subxt::ext::frame_metadata::RuntimeMetadataPrefixed;
 use subxt::{OnlineClient, PolkadotConfig};
 
@@ -15,8 +15,8 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let runtime_apis = api.runtime_api().at_latest().await?;
 
     // Ask for metadata and decode it:
-    let (_, meta): (Compact<u32>, RuntimeMetadataPrefixed) =
-        runtime_apis.call_raw("Metadata_metadata", None).await?;
+    let result_bytes = runtime_apis.call_raw("Metadata_metadata", None).await?;
+    let (_, meta): (Compact<u32>, RuntimeMetadataPrefixed) = Decode::decode(&mut &*result_bytes)?;
 
     println!("{meta:?}");
     Ok(())

subxt/examples/setup_config_assethub.rs

@@ -8,7 +8,7 @@ use subxt_signer::sr25519::dev;
     runtime_metadata_path = "../artifacts/polkadot_metadata_full.scale",
     derive_for_type(
         path = "staging_xcm::v3::multilocation::MultiLocation",
-        derive = "Clone",
+        derive = "Clone, codec::Encode",
         recursive
     )
 )]

subxt/examples/storage_fetch.rs

@@ -13,7 +13,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     // Build a storage query to access account information.
     let account = dev::alice().public_key().into();
-    let storage_query = polkadot::storage().system().account(&account);
+    let storage_query = polkadot::storage().system().account(account);
 
     // Use that query to `fetch` a result. This returns an `Option<_>`, which will be
     // `None` if no value exists at the given address. You can also use `fetch_default`

subxt/examples/storage_iterating_partial.rs

@@ -30,7 +30,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     // Build a storage query to iterate over open multisig extrinsics from
     // new_multisig_1.multisig which is the AccountId of the alice + bob multisig account
-    let alice_bob_account_id = &new_multisig_1.multisig;
+    let alice_bob_account_id = new_multisig_1.multisig;
     let storage_query = polkadot::storage()
         .multisig()
         .multisigs_iter1(alice_bob_account_id);